Gravity. If you want to know why you should look up Newton's laws of gravity all three of them.
The force of the Sun's gravity keeps them in their orbits.
The sun's gravity keeps them in orbit and prevents them from flying off into space. The planets travel quickly enough that they do not fall into the sun.
Gravity is what keeps the planets going in their orbits. If gravity just stopped, then the planets would go flying in a straight line tangent to their orbit.
The Sun's strong gravity keeps all the planets in orbit around it.
Gravitation keeps the planets from being pulled into the Sun.
Gravity and motion. Gravity pulls the planets in and keeps them from flying away, while the velocity of the planets keeps them from being sucked in completely.
The Sun's Gravitational pull keeps the planets orbiting it, not flying into deep space.
what keeps the moon from flying off into outer space
The gravity of the sun an each moon's respective planet keeps them from flying into space.
The Sun's strong gravity keeps all the planets in orbit around it.
The suns gravitational pull.
The force of the Sun's gravity keeps them in their orbits.
it keeps it in orbit
The suns gravitational pull keeps all the planets revolving around it. Without it, all the planets would go flying off into who knows where (including Earth) and the planets would of course crash into other objects and everything and everyone on Earth would die.
The sun's gravity keeps them in orbit and prevents them from flying off into space. The planets travel quickly enough that they do not fall into the sun.
Gravity is what keeps the planets going in their orbits. If gravity just stopped, then the planets would go flying in a straight line tangent to their orbit.
the sun because it keeps the planets in orbit and provides heat.